She is established as the "shield." Her protective nature toward Takeru is rooted in a childhood promise, but her combat prowess shows she is the top-tier power of the group.
The duel between Haruko and Uruchi Minaya demonstrates that conflict resolution in this world is physical and public. 3 : Welcome to Maken-ki
This episode shifts the focus from slapstick comedy to the technical side of the Tenbi Academy. We learn that "Maken" are not just weapons, but manifestations of a student's internal "Element." She is established as the "shield